NIC is working, but how?

[Mario Flores <marioflores@verizon.net>]

Hi:

   I just installed debian woody in a dell pc (400 Mhz, 128 megs, and a 
3com NIC: 3c905B 100BaseTX). During the installation of debian, the 
installation of any network card module failed. All network 
configuration was wrong and kept getting the "neighbour table overflow" 
message. After installation, I manually configured the 
/etc/netwrok/interfaces to have:

auto lo
auto eth0

iface lo inet loopback
iface eth0 inet dhcp

I rebooted the system expecting the eht0 not to work but at least fix 
the loopback interface and to my surprise eth0 was working as well! I 
could not find which module the kernel is using for eth0 anywhere. Is it 
possible that it is not using any module? The output for lsmod is:

Module                  Size  Used by
parport_pc              7276   1  (autoclean)
lp                      4580   0  (unused)
parport                 6676   1  [parport_pc lp]
af_packet               6136   1

The output for ifconfig is:

eth0      Link encap:Ethernet  HWaddr 00:C0:4F:70:91:B4
         inet addr:192.168.0.3  Bcast:192.168.0.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1492  Metric:1
         RX packets:7251 errors:0 dropped:0 overruns:0 frame:0
         TX packets:5574 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:100
         RX bytes:4234385 (4.0 MiB)  TX bytes:882175 (861.4 KiB)
         Interrupt:11 Base address:0xdc00

lo        Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         UP LOOPBACK RUNNING  MTU:3924  Metric:1
         RX packets:280 errors:0 dropped:0 overruns:0 frame:0
         TX packets:280 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:18208 (17.7 KiB)  TX bytes:18208 (17.7 KiB)

Does anyone know how debian configures the NIC? Thanks,

Mario.